Note: Definitions used here apply
specifically to Trichomycetes and their arthropod hosts.
| allantoid | Slightly curved with rounded ends. |
| amoebagenesis | Development of amoeboid cells within a thallus of an Amoebidiales. |
| appendages | Non-motile filamentous structures attached basally to trichospores of Harpellales or to one or both ends of sporangiospores of Eccrinales. |
| arbusculate | Tree-like in shape. |
| arthrospores | Spores formed as a result of disarticulation of vegetative cells in a thallus of Asellariales. |
| auxiliary spore | A cell that arises from a generative cell, but without appendages and after release capable of germinating in the gut where it was produced (see Allantomyces). |
| axenic | Living without the presence of other organisms. May refer to a pure culture of a fungus, or to an arthropod that has no microorganisms either internally or externally. |
| basipetal | Sequential development of sporangiospores or trichospores from the apex of a branch, or thallus toward the base. |
| clavate | Club-like, narrowing in the direction of the base. |
| coenocytic | An aseptate, multinucleate thallus. |
| collar | A structure that remains attached to the base of a trichospore after it detaches from the generative cell. |
| commensal | An organism that benefits from its association with another organism, but neither benefits nor harms the host. |
| conjugant | Either cell of a pair that conjugates (copulates), a process which eventually produces a zygote or zygospore. |
| coraloid | Much branched, like a coral in form. |
| cuticle | In the gut of arthropods, a lining secreted by epithelial cells of the foregut, or hindgut that consists of chitinous and non-chitinous materials. Also refers to the outer layers of nematode bodies and to the exoskeleton of arthropods. |
| cyst | A thick-walled spherical body that develops after amoebae of Amoebidiales cease to migrate, the cyst later produces cystospores. Also refers to the thick-walled and usually ellipsoidal cells of Harpellales that develop in the ovaries of the adult insect host. |
| cystospores | Elongate spores produced within the cyst of an Amoebidiales. |
| dimorphic | Producing two morphologically distinct forms such as two sizes or shapes of trichospores (Harpellales) or two sizes of thalli (Eccrinales). |
| eccrinid | Any species of Eccrinales. |
| ecdysis | The developmental process whereby the exoskeleton of arthropods is shed including cuticular linings of the gut and respiratory system. |
| eucarpic | Only part of the thallus forms reproductive structures. |
| extrusion | An in vivo process where the single sporangiospore within a trichospore (sporangium) is expelled and attaches to the gut lining and initiates growth. Can also be induced in vitro. In the older literature also referred to as trichospore germination. |
| exuvia | The cast-off exoskeleton of arthropods (see ecdysis). |
| generative cell | A specialized reproductive cell of Harpellales that produces an external trichospore and within which one or more appendages may also form. |
| harpellid | Any species of Harpellales. |
| heterothallic | A condition in which sexual reproduction will not occur except with another compatible thallus. |
| holdfast | A specialized structure that attaches a thallus to the substrate. It may consist of a secreted substance with a characteristic shape, or the entire basal cell of the thallus (the holdfast cell) may be modified for attachment. |
| holocarpic | The entire thallus forms reproductive structures. |
| homothallic | A condition in which sexual reproduction can occur in one thallus without requiring a sexual partner. |
| hypha | One of the filaments of a fungus. |
| lentic | Pertaining to standing, or still waters, such as a pool, pond, or lake. |
| lotic | Pertaining to running, or flowing waters, such as a stream. |
| Malpighian tubes (or tubules) | A set of excretory diverticula located at the anterior end of the hindgut of insects and some other arthropods. |
| molt | To shed the exoskeleton, and any associated cuticular linings during ecdysis in arthropods. Also, as a noun, refers to the shed skin (exoskeleton) or exuvia. |
| monomorphic | Having one morphological form. |
| multivoltine | Reproducing more than once a year, as in insects. |
| nomen dubium (nom. dub.) | A name which, although technically valid, cannot be satisfactorily typified due to an insufficient description or questionable interpretation of the fungal material described. |
| nomen nudum (nom. nud.) | A name which has not been validly published according to the International Code of Botanical Nomenclature. |
| obpyriform | Pear-shaped, but with attachment at the widest part. |
| peritrophic membrane | A thin, tubular membrane of chitin and protein continuously secreted by a ring of cells surrounding the anterior end of the midgut of an insect, serving to protect delicate epithelial cells of the midgut from abrasion. |
| petaloid | Broad (like a flowerpetal). |
| phytotelm | A plant that holdswater, such as in its leaf bases, or floral bracts. |
| primary infestation sporangiospore | A usually thick-walled, one- to four-nucleate, asexual eccrinid spore which serves as a dissemination unit to infect other individual hosts. |
| resistant spore | A thick-walled spore believed to remain viable under adverse conditions, such as desiccation. |
| scalariform | Ladder-like. |
| secondary infestation sporangiospore | A thin-walled asexual eccrinid spore, usually multinucleate, that can germinate within the gut where it was produced, thus increasing the number of thalli in the gut without external recruitment. |
| shaken cultures | Cultures grown in liquid medium contained in a flask and kept on an orbital or reciprocal shaker throughout the period of growth. |
| spore mother-cell | A germinated sporangiospore of an Eccrinales that has given rise to a new thallus. It is usually seen at the apex of the developing thallus, and may either persist to maturity of the thallus or disintegrate during thallial growth. |
| sporangiospore | An asexual spore produced within a sporangium. |
| substrate | Material on, or in which an organism is growing or to which it is attached. |
| thallus | Entire body of a fungus. |
| trichospore | A deciduous sporangium of Harpellales that usually has one or more appendages attached to its base, serving to disseminate the fungus from host to host. It contains a single uninucleate sporangiospore, and develops externally as an outgrowth from a generative cell. |
| vegetative propagule | A cell produced from a vegetative branch of a harpellid thallus that functions to produce another thallus within the same gut (see Graminella). |
| verrucose | Having small rounded processes or warts on the surface. |
| univoltine | Reproducing only once a year. |
| zygospore | A thick-walled sexual spore resulting from the fusion of two nuclei (karyogamy); usually preceded by the fusion of two cells (plasmogamy). |
| zygosporophore | The cell that supports a zygospore. |